mysqli connect and select from database error

https://stackoverflow.com/questions/22287261

12-06-2023
|

質問

I recently started using mysqli_ to connect to my database because of the concern of sql injection and lack of security. I'm trying to reconfigure my login page with mysqli from mysql but the page just won't load and I'm not sure why. Thanks in advance for any help.

Here is my code:

<?php
$mysqli = new mysqli("localhost", "username", "password", "db");

if($mysqli->connect_errno > 0){
    die('Unable to connect to database [' . $mysqli->connect_error . ']');
}

if (!isset($_SESSION['email'])) {

$e = trim($_REQUEST['email']);
$email = mysqli->real_escape_string($e);
$p = trim($_REQUEST['password']);
$password = mysqli->real_escape_string($p);

if ($result = $mysqli->query("SELECT email, password" .
                                             " FROM users" .
                                             " WHERE email = '".$email."' AND password = '".$password."'")) {
    printf("Select returned %d rows.\n", $result->num_rows);

if ($result->num_rows == 1) {
$row = $result->fetch_array(MYSQLI_NUM);
   $user_id = $ow['user_id'];
   //No more setcookie
   $_SESSION['user_id'] = $user_id;
   $_SESSION['email'] = $email;
}

    /* free result set */
    $result->close();
}

}
?>
<html>
<head>

<title>Login</title>

</head>
<body>

<form id="signin_form"
               action="<?php echo $_SERVER['PHP_SELF']; ?>"
               method="POST">
      <div class="signin_box">
         <label for="email">Email or Username:</label><br>
         <input type="text" name="email" id="email" size="30" />
         <br />
         <label for="password">Password:</label>
         <input type="password" name="password" id="password" size="30" />

     <br />
<span class="signin_submit">
        <input type="submit" value="Sign In" class="signin_submit" />
</span>
     </div>
   </form>

</body>
</html>

解決

Here

$email = mysqli->real_escape_string($e);

You forgot $

$email = $mysqli->real_escape_string($e);

and

$password = mysqli->real_escape_string($p);

$password = $mysqli->real_escape_string($p);

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